Mon Oct 22 14:19:29 2018
The raster GIS layer on Buffaloes (2010) described in this document are part of the Gridded Livestock of the World database (GLW v3.1).
The GLW database was developped to meet three objectives:
Two main methods have been described in the litterature for distributing census data at the pixel level. The areal-weighted (AW) method simply considers that all pixels of the census area are equally suitable, and assign them an equal weight. It simply corresponds to the density of animals per km2 in the census unit multiplied by the pixel area. The dasymetric method (DA) assigns different weights to different pixels based on high resolution environmental predictor variables and Random Forest models, and the animal census counts are distributed according to these weights.
The AW and DA GLW global distribution data fit different purposes. The DA GLW models provide an estimate of how livestock species may be distributed within census areas. However, spatial predictors (e.g. human population density, vegetation indices, topography, etc.) that are used to derived the downscaling weights may introduce some uncontrolled counfonding effects for users willing to quantify the effect of livestock alongside these spatial predictors on an outcome. Similarly, the DA models may introduce circularity for users willing to use livestock data to study their impact on some these spatial factors, such as land-use, for example. The AW GLW models are free of any influence of spatial predictor variables, but produces more unrealistic distribution patterns, especially in large census areas containing a wide range of different land-use and farming conditions.
This report presents snapshots and links to high resolution maps of the different data layers available with the GLW v3.1 data package for Buffaloes (2010). Three GIS layers are provided, as geotiff, with an extent of X:-180 to 180 / Y:-90 to 90, a resolution of 0.083333 decimal degrees, and with the projection CRS “+proj=longlat”:
Note that the snapshot below were produced in the equal-area pseudocylindrical Eckert IV projection for a proper representation of densities. The standard lat/long visualisation of global raster data tend to visually over-represent animal densities in pixels located in northern latitudes as they cover a much lower surface on earth than those close to the equator. Altough the data files are distributed in lat/long, we recommend the use of an equal-area projection for displaying our livestock density data.
A high-resolution version can be visualised here.
The average spatial resolution (ASR) gives an estimate of the average resolution of each spatial unit used to build the GLW models. It is estimated, for each country as \(\sqrt[root]{Area/N_u}\), where Area is the surface of the country in square km, and \(N_u\) is the number of sub-national units per country.
The following histogram and maps show the year of sub-national census data used for the GLW models.
The following plot shows the goodness of fit metrics of the predictions summarized by continent and polygon size. Note that these GOF are all established through cross-validation, i.e. by measuring the correlation between observed and predicted animal numbers (log10-transformed) in polygons that were not used to train the Random Forest models (see Nicolas et al. 2015, for details). Note that some values are supported by a very low number of polygons (indicated by the np, which is the mean number of polygons used to estimate the correlation between observed and predicted values at each bootstrap).
The GLW database was originally described by Wint & Robinson (GLW v1, 2007) and used the DA method with weights quantified through stratified multiple regressions. The modelling procedure was automated and standardized for GLW v2 (Robinson et al. 2014) and the methodology used to derived the weights was recently improved by replacing stratified linear regression by Random Forest for producing GLW v3.0 (Nicolas et al. 2016). This dataset is described in full in Gilbert et al. (2018).
| Country | ASR | Year | Census | FAOSTAT | Source | |
|---|---|---|---|---|---|---|
| AZE | Azerbaijan | 35.0 | 2012 | 265,922 | 277,400 | The State Statistical Committee of the Republic of Azerbaijan |
| ARG | Argentina | 340.4 | 2011 | 82,094 | NA | Ministerio de Agricultura, Ganadería y Pesca, Argentina |
| AUS | Australia | 982.3 | 2011 | 4,414 | NA | Australian Bureau of Statistics |
| BGD | Bangladesh | 46.3 | 2008 | 541,184 | 1,349,000 | Bangladesh Bureau of Statistics |
| BLZ | Belize | 61.0 | 2011 | 26 | NA | World Organisation for Animal Health - OIE |
| MMR | Myanmar (Burma) | 45.9 | 2011 | 3,075,813 | 2,977,150 | Livestock Breeding and Veterinary Department (LBVD), Ministry of Livestock Breeding and Fisheries, Yangon,Myanmar |
| BRA | Brazil | 39.4 | 2012 | 1,261,958 | 1,184,511 | Istituto Brasileiro de Geografia e Estatistica |
| BTN | Bhutan | 13.8 | 2012 | 737 | 928 | Ministry of Agriculture and Forest, Royal Government of Bhutan |
| BGR | Bulgaria | 63.8 | 2010 | 9,542 | 8,311 | Ministry of Agriculture and Forestry - Agrostatistics Directorate, Bulgaria |
| CAN | Canada | 40.7 | 2011 | 83,935 | NA | Statistics Canada |
| KHM | Cambodia | 31.2 | 2011 | 672,727 | 702,074 | Ministry of Agriculture, Forestry and Fisheries |
| LKA | Sri Lanka | 51.6 | 2012 | 414,630 | 422,650 | Agriculture and Environment Statistics Division, Department of Census and Statistics, Sri Lanka |
| CHN | China | 63.2 | 2002 | 22,723,012 | 23,598,000 | China Agricultural Press |
| COL | Colombia | 189.2 | 2013 | 188,079 | NA | Instituto Colombiano Agropecuario |
| ECU | Ecuador | 105.9 | 2012 | 3,396 | NA | World Organisation for Animal Health - OIE |
| EGY | Egypt | 191.0 | 2010 | 3,818,242 | 3,818,236 | Economic Affaire Sector, Ministry of Agriculture and Land Reclamation, Egypt |
| GEO | Georgia | 31.8 | 2004 | 29,541 | 17,500 | National Statistics Office of Georgia |
| DEU | Germany | 165.3 | 2013 | 5,850 | 4,200 | European Union Statistical Office - EUROSTAT |
| GRC | Greece | 50.9 | 2009 | 3,716 | 1,700 | Hellenic Statistic Autority EL.STAT |
| GTM | Guatemala | 18.2 | 2003 | 1,948 | NA | Instituto Nacional de Estadística, Guatemala |
| IDN | Indonesia | 65.8 | 2013 | 1,082,393 | 1,999,500 | Badan Pusat Statistik, Republik Indonesia |
| IND | India | 73.3 | 2012 | 112,751,266 | 107,375,000 | Department of Animal Husbandry, Dairying & Fisheries - Ministry of Agriculture - Government of India |
| IRN | Iran | 241.0 | 2005 | 2,684,490 | 212,400 | Statistical Centre of Iran |
| ITA | Italy | 54.1 | 2010 | 360,287 | 365,086 | Istituto Nazionale di Statistica |
| IRQ | Iraq | 155.9 | 2010 | 285,537 | 295,000 | World Organisation for Animal Health - OIE |
| LAO | Laos | 40.8 | 2011 | 773,695 | 1,189,000 | Department of Livestock and Fisheries, Laos |
| SVK | Slovakia | 110.7 | 2010 | 500 | NA | Statistical Office of the Slovak Republic |
| MYS | Malaysia | 154.0 | 2012 | 118,674 | 125,900 | Department of Statistics, Malaysia (Jabatan Perangkaan Malaysia) |
| MOZ | Mozambique | 256.8 | 2011 | 366 | NA | World Organisation for Animal Health - OIE |
| NPL | Nepal | 44.3 | 2009 | 4,626,618 | 4,836,984 | Ministry of agriculture and cooperatives (MOAC), Nepal |
| PAK | Pakistan | 83.9 | 2010 | 25,990,253 | 29,413,000 | Agricultural Census Organization, Ministry of Food & Agriculture, Pakistan |
| PAN | Panama | 11.4 | 2011 | 2,394 | NA | Instituto Nacional de Estadística y Censo, Panamá |
| ROU | Romania | 76.2 | 2012 | 22,380 | NA | World Organisation for Animal Health - OIE |
| PHL | Philippines | 13.8 | 2010 | 2,961,485 | 3,270,400 | Bureau of Agricultural Statistics (BAS) |
| ESP | Spain | 163.2 | 2012 | 704 | NA | World Organisation for Animal Health - OIE |
| SYR | Syria | 120.4 | 2012 | 6,375 | 7,000 | World Organisation for Animal Health - OIE |
| THA | Thailand | 82.6 | 2013 | 908,055 | 1,622,646 | World Organisation for Animal Health - OIE |
| TUR | Turkey | 29.0 | 2014 | 120,627 | 87,207 | Turkish Statistical Institute |
| GBR | United Kingdom | 246.9 | 2012 | 3,719 | NA | -9999 |
| USA | United States | 54.1 | 2012 | 57,017 | NA | National Agricultural Statistics Service - United States Department of Agriculture |
| VEN | Venezuela | 57.4 | 2007 | 225,790 | NA | Ministerio del Poder Popular para la Agricultura y Tierras - Venezuela |
| VNM | Vietnam | 5.6 | 2001 | 2,778,333 | 2,877,000 | General Statistics Office of Vietnam |
| SWZ | Swaziland | 65.9 | 2013 | 95 | NA | World Organisation for Animal Health - OIE |
| Reference | |
|---|---|
| AZE | The data on regions, 2012 (http://www.stat.gov.az/source/agriculture/indexen.php) |
| ARG | Ganados y Carnes - Anuario 2011 (http://64.76.123.202/site/ganaderia/anuario/index.php) |
| AUS | Agricultural commodities. Agriculture Census 2011 |
| BGD | Census of Agriculture 2008 (http://www.bbs.gov.bd/PageWebMenuContent.aspx?MenuKey=371) |
| BLZ | Belize: World Animal Health Information Database (WAHID) - Animal Population 2010-2011 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| MMR | Myanmar Farm Animal Resources:Numbers and Distributions from Administrative Returns, 2011/12 |
| BRA | Produção da Pecuária Municipal - 2012 (http://www.ibge.gov.br/home/estatistica/economia/ppm/2012/default.shtm) |
| BTN | Livestock Statistics 2012 (http://www.moaf.gov.bt/moaf/?wpfb_dl=844) |
| BGR | Agricultural Census 2010 (http://www.mzh.government.bg/MZH/ShortLinks/SelskaPolitika/Agrostatistics/Structure_agricultural_holdings/Results.aspx) |
| CAN | 2011 Census of Agriculture (http://www.statcan.gc.ca/ca-ra2011/index-eng.htm) |
| KHM | Cambodia Livestock Census 2011 |
| LKA | Livestock Population by Type and by District - 2003 - 2012 (http://www.statistics.gov.lk/agriculture/Livestock/LivestockPopulationSubnational.html) |
| CHN | a) China Level 1/02: China Agric. Press, 2003, and Taiwan Level 0/02: Stat. Office, Executive Yuan. Stat. Yearbook, 2010. b) China Level 3/96: Food and Agric. Stat. Centre, China. Abstract of the 1st National Agric. Census in China, Office of China |
| COL | Consolidado Nacional por Especies 2013 (http://www.ica.gov.co/Areas/Pecuaria/Servicios/Epidemiologia-Veterinaria/Censos-2013/Especies-Consolidado-Nacional.aspx) |
| ECU | Ecuador: World Animal Health Information Database (WAHID) - Animal Population 2012 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| EGY | Statistics of Livestock 2010 |
| GEO | First National Agricultural Census 2004 in Georgia (http://geostat.ge/cms/site_images/_files/english/agriculture/census/section7.pdf) |
| DEU | Agr_r_animal-Animal populations (http://epp.eurostat.ec.europa.eu/portal/page/portal/agriculture/data/database - last access feb 2014) |
| GRC | 2009 Agricultural and Livestock Census (provisional data) |
| GTM | IV Censo Nacional Agropecuario, 2003 (http://www.ine.gob.gt/np/agropecuario/tomo%20IV.pdf) - last access 01/2014 |
| IDN | Data Sensus Pertanian 2013 (http://st2013.bps.go.id/dev2/index.php) |
| IND | 19th Livestock Census - 2012, all india report (http://www.dahd.nic.in/dahd/WriteReadData/Livestock.pdf) |
| IRN | Iran Statistical Yearbook 1385 (2005) |
| ITA | Censimento Agricultura 2010 (http://dati-censimentoagricoltura.istat.it) |
| IRQ | Iraq: World Animal Health Information Database (WAHID) - Animal Population 2008-2010 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| LAO | Lao Livestock census Data 2011/12 In: PDR Farm Animal Distributions, 2011: Comparative Maps of Agricultural Census and Administrative Returns |
| SVK | Livestock by territory, Products and period |
| MYS | Selected Agricultural Indicators 2013 (Indikator Pertanian Terpilih 2013) (http://www.statistics.gov.my/portal/index.php?option=com_content&view=article&id=1834:free-download&catid=61&Itemid=111&lang=bm) |
| MOZ | Mozambique: World Animal Health Information Database (WAHID) - Animal Population 2011-2012 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| NPL | 2009 data |
| PAK | Agricultural Census 2010 (http://www.pbs.gov.pk/content/agricultural-census-2010-pakistan-report) |
| PAN | VII Censo Nacional Agropecuario. Resultados Finales (http://www.contraloria.gob.pa/inec/Publicaciones/subcategoria.aspx?ID_CATEGORIA=15&ID_SUBCATEGORIA=60&ID_IDIOMA=1) |
| ROU | Romania: World Animal Health Information Database (WAHID) - Animal Population 2008-2012 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| PHL | Livestock survey Philippines 2010 |
| ESP | Spain: World Animal Health Information Database (WAHID) - Animal Population 2010-2013 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| SYR | Syrian Arab Republic: World Animal Health Information Database (WAHID) - Animal Population 2008-2012 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| THA | Thailand: World Animal Health Information Database (WAHID) - Animal Population 2007-2013 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |
| TUR | Livestock Database 2014 (http://tuikapp.tuik.gov.tr/hayvancilikapp/hayvancilik_ing.zul) |
| GBR | -9999 |
| USA | 2012 Census of Agriculture (http://www.agcensus.usda.gov/Publications/2012/) |
| VEN | VII Censo Agrícola - 2007 |
| VNM | Agricultural Census database 2001 |
| SWZ | Swaziland: World Animal Health Information Database (WAHID) - Animal Population 2012-2013 (http://www.oie.int/wahis_2/public/wahid.php/Countryinformation/Animalpopulation) |